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BRAKE WARNING LAMP REMAINS ON BRC-177 < SYMPTOM DIAGNOSIS > [VDC/TCS/ABS] C D E G H I J K L M A B BRC N O P BRAKE WARNING LAMP REMAINS ON Description INFOID:0000000004212750 The brake ECU is connected to the combination meter with CAN communication via HV ECU. If any of the fol- lowing is detected, the brake warning lamp remains on: • The brake ECU connector is disconnected from the brake ECU. • The brake fluid level is insufficient. • The parking brake is applied. • EBD operation is not possible. • There is a malfunction in the brake ECU or HV ECU. • There is an open in the harness between the combination meter, HV ECU and brake ECU. Diagnosis Procedure INFOID:0000000004212751 CAUTION: When replacing the brake ECU, perform initialization of linear solenoid valve and calibration. 1. CHECK DTC Check if the ABS, VDC and/or Electronically Controlled Brake DTC is output. Result A >> GO TO 2. B >> Repair circuit indicated by output DTC. 2. CHECK CAN COMMUNICATION SYSTEM Check if the CAN communication system DTC is output. Result A >> GO TO 3. B >> Inspect CAN communication system. 3. INSPECT HV ECU Perform HV ECU self-diagnosis. YES >> Repair or replace malfunctioning components. NO >> GO TO 4. 4. CHECK IF BRAKE ECU CONNECTOR IS SECURELY CONNECTED Check if the brake ECU connector is securely connected. NOTE: The connector should be securely connected. YES >> GO TO 5. NO >> Connect connector to ECU correctly. 5. CHECK AUXILIARY BATTERY Check the auxiliary battery voltage. Condition Proceed to DTC is not output. A DTC is output. B Condition Proceed to DTC is not output. A DTC is output. B Standard voltage : 11 to 14 V |